Founders

Solar-powered aircraft do not require fuel, so they don't require oxygen, and they are able to operate at altitudes over 20 kilometres (12 mi) to 100 kilometres (62 mi) for months at a time.
Can this be efficient due to a weather change in some areas during flight from one region to another?

While solar-powered aircraft offer unique advantages, weather changes can indeed affect their efficiency, especially during long flights from one region to another. Turbulence, cloud cover, and temperature variations can impact solar energy absorption and aircraft performance.